Have you ever considered using water and not air to keep a hole opened? A small pump shooting water straight up. May keep ice and snow off a small spot for your aerator to work. It takes a lot to freeze moving water. I know some cattle tanks use this method to keep them from freezing.

61 acre water shed lake. bass, channel cat, black crappie, wiper, walleye, redear sunfish and bluegill. To many bullhead and common carp